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Lap-by-Lap: Darlington

Lap 370 -- CHECKERED FLAG: Regan Smith stays fast, holds off Carl Edwards and wins the Showtime Southern 500 at Darlington. Meanwhile, Kyle Busch and Kevin Harvick meet on the track as tempers flare after the last on-track incident. Harvick leaps out of his car, reaches into the No. 18 and throws a punch as Busch shoves the No. 29 into the wall without its driver. Smith sheds a tear in Victory Lane, saying that his mother -- who attends all of his races -- wasn't able to be at the track Saturday due to her participation in tornado relief efforts in Alabama.

Lap 369 -- WHITE FLAG: Regan Smith gets off to a good start and pulls away from Carl Edwards.

Lap 368 -- GREEN FLAG: Regan Smith leads the field back to green in the No. 78.

Lap 325 -- Martin Truex Jr. is tight and gets an air adjustment. Greg Biffle is on pit road with a free car, he takes for tires an an air adjustment. Paul Menard makes his final stop, along with David Reutimann.

Lap 324 -- Casey Mears and Jimmie Johnson pits for four tires and an air adjustment.

Lap 323 -- Drivers continue to cycle through green-flag pit stops.

Lap 322 -- Jeff Gordon moves into fifth after tapping the wall. Marcos Ambrose pits with a tight car in the middle, he takes four tires and fuel.

Lap 321 -- Ryan Newman pits for tires and fuel and wants no changes.

Lap 320 -- Jamie McMurray pits with a vibration.

Lap 319 -- Denny Hamlin won't budge from the fifth spot and says the car is tight but improving.

Lap 318 -- Carl Edwards is closing the gap on leader Kasey Kahne.

Lap 317 -- David Ragan remains the last car on the lead lap.

Lap 316 -- Regan Smith holds onto 11th.

Lap 315 -- Marcos Ambrose drops to 16th.

Lap 314 -- Jimmie Johnson moves back into 15th.

Lap 313 -- Kyle Busch can't catch Clint Bowyer for ninth.

Lap 312 -- Jeff Gordon is gaining on Kevin Harvick for third.

Lap 311 -- Kasey Kahne increases his lead ahead of Kevin Harvick.

Lap 310 -- Jamie McMurray moves into 14th.

Lap 309 -- Greg Biffle moves up to 13th.

Lap 308 -- Carl Edwards says he's got the car to beat.

Lap 306 -- Ryan Newman moves up to eighth.

Lap 305 -- Carl Edwards says if they can get the No. 99 out front, they can win.

Lap 304 -- Kasey Kahne remains out front as the field approaches their last pit stops of the race.

Lap 129 -- Jeff Gordon is slow out of Turn 2 and backs up the field in 10th.

Lap 128 -- David Reutimann drops fast on two tires, down to sixth.

Lap 127 -- GREEN FLAG: Kyle Busch leads the field to green.

Lap 126 -- One lap until green. Paul Menard is too fast on exit.

Lap 125 -- Kyle Busch is the new leader, followed by Carl Edwards, David Reutimann, Tony Stewart and Kevin Harvick.

Lap 124 -- Pit road is open: Paul Menard is clipped by Brad Keselowski, spins at his stall. Tony Stewart's team drops a lug nut. Kasey Kahne says he screwed up the best car at the track. Kyle Busch is first off pit road.

Lap 87 -- One lap to go until green. Thirty cars remain on the lead lap.

Lap 86 -- The No. 42 has minimal damage as well.

Lap 85 -- Juan Montoya apologizes but says the No. 48 got out of the gas early. Jimmie Johnson wants to know what he did wrong. Johnson gets four tires, appears to have minimal damage and leaves pit road on the lead lap.

Lap 43 -- Kasey Kahne set a record in qualifying Friday and is proving the No. 4 has plenty of speed as he pulls away from Kyle Busch in the No. 18.

Lap 42 -- Kasey Kahne gets a good run on the high side and holds off Kyle Busch.

Lap 41 -- GREEN FLAG: Pole-sitter Kasey Kahne leads the field back to green, followed by Kyle Busch, Jeff Gordon and Tony Stewart. Carl Edwards remains concerned about the splitter on the No. 99 making contact with the track.

Lap 40 -- Ken Schrader pits as Kasey Kahne assumes the lead.

Lap 39 -- Ken Schrader remains the race leader, followed by Kasey Kahne, Kyle Busch, Jeff Gordon and Tony Stewart. Clint Bowyer reports passing a brake pad on the track and may delay the restart for another lap.

Lap 38 -- Casey Mears heads down pit road. Ken Schrader stays out in the No. 32 and will lead a lap under yellow.

Lap 37 -- Most of the field heads down pit road. Tony Stewart takes four tires and fuel. Ryan Newman reaches his pit stall, takes four tires and fuel. Kasey Kahne wins the race off pit road. Casey Mears will get credit for leading a lap after staying out.

Lap 36 -- Ryan Newman remains out front as drivers prepare to pit for new tires, fuel and adjustments.

Lap 35 -- Robby Gordon gets the free pass. This caution takes the place of the competition yellow scheduled for Lap 40.

6:45 p.m. ET -- It's sunny at the Lady in Black with temperatures currently in the 70s. Temperatures are expected to drop into the 50s as the sun goes down and there is no rain in the forecast. Kasey Kahne is on the pole when the green drops for the Showtime Southern 500 at 7:45 p.m. ET.

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